<template>
  <div>
    <!--  面包屑导航区-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!--  卡片视图区域-->
    <el-card>
      <!--      提示区域-->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!--      步骤条区域-->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!--      tab栏区域-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_name">
              <el-cascader
                  expandTrigger="hover"
                  v-model="addForm.goods_cat"
                  :options="catelist"
                  :props="cateProps"
                  prop="goods_cat"
                  @change="handleChange">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--          渲染表单的item项-->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                          :key="manyTableData.attr_id">
              <!--              复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--            action 图片要上传到的后台API地址-->
            <el-upload
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj"
                :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!--            富文本编辑器组件-->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!--    图片预览-->
    <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
// 用于进行深拷贝的依赖包
import _ from 'lodash'

export default {
  name: "Add",
  data() {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          {required: true, message: '请输入商品名称', trigger: 'blur'}
        ],
        goods_price: [
          {required: true, message: '请输入商品价格', trigger: 'blur'}
        ],
        goods_weight: [
          {required: true, message: '请输入商品重量', trigger: 'blur'}
        ],
        goods_number: [
          {required: true, message: '请输入商品数量', trigger: 'blur'}
        ],
        goods_cat: [
          {required: true, message: '请选择商品分类', trigger: 'blur'}
        ]
      },
      // 商品分类列表
      catelist: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: 'http://47.108.206.212:9999/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem("token")
      },
      previewPath: '',
      previewVisible: false,
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类的数据
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类数据失败")
      }
      this.catelist = res.data
    },
    // 级联选择器选中项变化，会出发这个函数
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      // console.log("即将离开的标签页名字是：" + oldActiveName)
      // console.log("即将离开的标签页名字是：" + activeName);
      // return false
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请先选择商品分类")
        return false
      }
    },
    async tabClicked() {
      // console.log(this.activeIndex);
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'many'}})
        if (res.meta.status !== 200) {
          return this.$message.error("获取动态参数列表失败")
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'only'}})
        if (res.meta.status !== 200) {
          return this.$message.error("获取静态属性列表失败")
        }
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 调用数组的splice方法，把图片信息对象从pics数组中移除
      this.addForm.pics.splice(i, 1)

    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response);
      // 拼接得到一个图片信息对象
      const picInfo = {pic: response.data.tmp_path}
      // 将图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo)
    },
    // 添加商品
    add() {
      // console.log(this.addForm.goods_introduce);
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error("请填写必要的表单项")
        }
        // 执行添加的业务逻辑
        // 通过lodash进行深拷贝
        // 级联选择器使用的good_cat是数组，而这里需要的是字符串，所以通过深拷贝复制一份独立使用
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')}
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // 发起请求添加商品，商品的名称必须是唯一的
        const {data: res} = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error("添加商品失败")
        }
        this.$message.success("添加商品成功")
        await this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      } else {
        return null
      }
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 15px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>